Size:

XS: Chest circumference 30cm back length 20cm suitable for weight 0.5-1.5 kg

S: Chest circumference 35cm back length 25cm suitable for weight 1.5-2.5kg

M: Chest circumference 40cm back length 30cm suitable for weight 2.5-4kg

L: Chest circumference 45cm back length 35cm suitable for weight 4-5.5kg

XL: Chest circumference 50cm back length 38cm suitable for weight 5.5-7.5kg